To define constraints and loads, use the commands available in the ribbon panels. Alternatively, right-click the browser node for the input type, and click the command there.
Constraints panel
Fixed
.The dialog box displays with the Face selector active.

Add the second constraint:

Next, we add a force or load. These steps define a condition where the assembly receives a constant load in a given direction.
Loads panel
Force
.
The dialog box displays.

We now have defined materials, structural load, and constraints. In the browser, expand the Constraints and Loads nodes for viewing. Click a node to highlight the selection or location in the graphics window; and double-click to edit the definition.